Probing the nodal structures of heavy electron superconductors by means of specific heat measurements in magnetic fields

T. Sakakibara; J. Custers; K. Yano; A. Yamada; T. Tayama; Y. Aoki; H. Sato; H. Sugawara; H. Amitsuka; M. Yokoyama

doi:10.1016/j.physb.2007.10.235

Probing the nodal structures of heavy electron superconductors by means of specific heat measurements in magnetic fields

T. Sakakibara^*, J. Custers, K. Yano, A. Yamada, T. Tayama, Y. Aoki, H. Sato, H. Sugawara, H. Amitsuka, M. Yokoyama

^*この論文の責任著者

物理学科

研究成果: ジャーナルへの寄稿 › 学術論文 › 査読

2 被引用数 (Scopus)

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Measurements of the angle-resolved specific heat C (H, θ) have been performed on PrOs₄ Sb₁₂ and URu₂ Si₂ in order to examine their superconducting gap structures. In the filled skutterudite PrOs₄ Sb₁₂, a clear fourfold angular dependence is observed with H rotated in the (1 0 0) planes, whose field variation suggests gap minima along [1 0 0] directions. Interestingly, a reversed angular oscillation of C (H, θ) has been observed in the normal state above H_{c 2} which continues to grow as the high-field antiferroquadrupole phase is approached. In URu₂ Si₂, C (H, θ) with H rotated around the tetragonal c-axis suggests that the nodal structure has rotational symmetry. Comparison between the C (H) data for a- and c-axes indicates the existence of point nodes along the [0 0 1] direction.

本文言語	英語
ページ（範囲）	990-993
ページ数	4
ジャーナル	Physica B: Condensed Matter
巻	403
号	5-9
DOI	https://doi.org/10.1016/j.physb.2007.10.235
出版ステータス	出版済み - 2008/04/01

ASJC Scopus 主題領域

電子材料、光学材料、および磁性材料
凝縮系物理学
電子工学および電気工学

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10.1016/j.physb.2007.10.235

引用スタイル

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title = "Probing the nodal structures of heavy electron superconductors by means of specific heat measurements in magnetic fields",

abstract = "Measurements of the angle-resolved specific heat C (H, θ) have been performed on PrOs4 Sb12 and URu2 Si2 in order to examine their superconducting gap structures. In the filled skutterudite PrOs4 Sb12, a clear fourfold angular dependence is observed with H rotated in the (1 0 0) planes, whose field variation suggests gap minima along [1 0 0] directions. Interestingly, a reversed angular oscillation of C (H, θ) has been observed in the normal state above Hc 2 which continues to grow as the high-field antiferroquadrupole phase is approached. In URu2 Si2, C (H, θ) with H rotated around the tetragonal c-axis suggests that the nodal structure has rotational symmetry. Comparison between the C (H) data for a- and c-axes indicates the existence of point nodes along the [0 0 1] direction.",

keywords = "Anisotropic superconductors, Nodal structure, Skutterudite, Specific heat",

author = "T. Sakakibara and J. Custers and K. Yano and A. Yamada and T. Tayama and Y. Aoki and H. Sato and H. Sugawara and H. Amitsuka and M. Yokoyama",

year = "2008",

month = apr,

day = "1",

doi = "10.1016/j.physb.2007.10.235",

language = "英語",

volume = "403",

pages = "990--993",

journal = "Physica B: Condensed Matter",

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TY - JOUR

T1 - Probing the nodal structures of heavy electron superconductors by means of specific heat measurements in magnetic fields

AU - Sakakibara, T.

AU - Custers, J.

AU - Yano, K.

AU - Yamada, A.

AU - Tayama, T.

AU - Aoki, Y.

AU - Sato, H.

AU - Sugawara, H.

AU - Amitsuka, H.

AU - Yokoyama, M.

PY - 2008/4/1

Y1 - 2008/4/1

N2 - Measurements of the angle-resolved specific heat C (H, θ) have been performed on PrOs4 Sb12 and URu2 Si2 in order to examine their superconducting gap structures. In the filled skutterudite PrOs4 Sb12, a clear fourfold angular dependence is observed with H rotated in the (1 0 0) planes, whose field variation suggests gap minima along [1 0 0] directions. Interestingly, a reversed angular oscillation of C (H, θ) has been observed in the normal state above Hc 2 which continues to grow as the high-field antiferroquadrupole phase is approached. In URu2 Si2, C (H, θ) with H rotated around the tetragonal c-axis suggests that the nodal structure has rotational symmetry. Comparison between the C (H) data for a- and c-axes indicates the existence of point nodes along the [0 0 1] direction.

AB - Measurements of the angle-resolved specific heat C (H, θ) have been performed on PrOs4 Sb12 and URu2 Si2 in order to examine their superconducting gap structures. In the filled skutterudite PrOs4 Sb12, a clear fourfold angular dependence is observed with H rotated in the (1 0 0) planes, whose field variation suggests gap minima along [1 0 0] directions. Interestingly, a reversed angular oscillation of C (H, θ) has been observed in the normal state above Hc 2 which continues to grow as the high-field antiferroquadrupole phase is approached. In URu2 Si2, C (H, θ) with H rotated around the tetragonal c-axis suggests that the nodal structure has rotational symmetry. Comparison between the C (H) data for a- and c-axes indicates the existence of point nodes along the [0 0 1] direction.

KW - Anisotropic superconductors

KW - Nodal structure

KW - Skutterudite

KW - Specific heat

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U2 - 10.1016/j.physb.2007.10.235

DO - 10.1016/j.physb.2007.10.235

M3 - 学術論文

AN - SCOPUS:39749130371

SN - 0921-4526

VL - 403

SP - 990

EP - 993

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

IS - 5-9

ER -

Probing the nodal structures of heavy electron superconductors by means of specific heat measurements in magnetic fields

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